Omfg I
Tomoko. While I suppose it's too bad that Aina left, I feel like it actually benefits the group vocally. While I don't know what the back two really sound like, I'm amazed at how well they sound vocally at debut. There's no apparent makes-your-ear-bleed singer in the group like some other H!P groups.
Wasn't a huge fan of the song on first listen, but I'm totally digging it now. Also agree with the above comment of covering old H!P (T&C, Melon) songs. They would be one group who could actually handle it well.